Method of and apparatus for producing core yarns



y 1969 P. VQRISEK 3,445,993

METHOD OF AND APPARATUS FOR PRODUCING CORE YARNS Filed Jan. 19, 1967 I N VE N TOR Pre 171751 lmkek Malawi x 6M- ADV-7 United States Patent O 3,445,993 METHOD OF AND APPARATUS FOR PRODUCING CORE YARNS Pfemysl Vofisek, Chocen, Czechoslovakia, assignor to Vyzkumny Ustav Bavlnarsky, Usti nad Orlici, Czechoslovakia Filed Jan. 19, 1967, Ser. No. 610,296 Claims priority, application Czechoslovakia, Mar. 9, 1966, 1,573/66 Int. Cl. D02g 3/36; D01h 7/00 U.S. Cl. 57-6 10 Claims ABSTRACT OF THE DISCLOSURE This invention relates to a method and an apparatus for producing a core yarn, and more particularly to such a method and such an apparatus for winding around a core of previously spun yarn an outer yarn which may be spun from another type of fiber and which may conceal the outer layer of the previously spun yarn. The invention is especially useful in connection with winding about a core of previously spun yarn a second artificial or synthetic yarn.

A method is known in which a modified spinning machine with a spinning ring and traveler thereon acts upon conventionally processed yarn by winding a yarn which is currently being spun about a core of previously spun yarn. In this method, however, uneven winding of the core yarn results, influencing the yarn quality detrimentally. The apparatus for carrying out this method has many imperfections and its efliciency is rather low.

A method is also known in which a modified device for carrying out the continuous ringless spinning process is used for winding the yarn constituting the core of the core yarn. In this process, the core is surrounded by fibrous material. Moreover,.the yarn forming the core of the core yarn is given an additional twist. This is detrimental.

In methods and apparatus for producing core yarn which are already known, not only is poor core yarn quality obtained, and not only is the apparatus imperfectly adapted to such production and inefficient, but the rate of production of the core yarn is relatively slow.

-It is the object of the present invention to improve core yarn quality, to prevent any additional twist being given the previously spun yarn which forms the core of the core yarn, and to permit the use of materials of considerable strength thereby providing core yarn having surpassing strength.

Another object is to make possible a high rate of core yarn production. v

Another object is to prevent twisting of the core during winding of the outer yarn thereon.

According to the invention previously spun yarn forms the core of the core yarn and is passed through a continuously rotating spinning chamber along its axis of rotation. Fibers of the material which is to form the winding yarn are fed to the spinning chamber to form a second yarn therein, and are there wound as a second yarn about the first or core yarn. As the second yarn is Wound about the core, the core is withdrawn from the spinning chamber along the axis of rotation of the chamber through a stationary withdrawal tube. Winding of the second yarn about the core is continued within this tube due to the rotary movement of the spinning chamber.

It is to be observed that the invention requires that the core pass through a rotating spinning chamber along its axis of rotation, the completed core yarn being withdrawn from the rotating spinning chamber along the same axis. For this purpose a stationary feeding tube for the core extends into the spinning chamber and a coaxial withdrawal tube for the completed core yarn extends outwardly from the spinning chamber.

It is advantageous, according to the present invention, that the feeding tube penetrate the space within the spinning chamber. It is further advantageous to employ a feeding tube which has a diameter corresponding to at least approximately the diameter of the core of the core yarn being produced.

The novel features which are considered as characteristic for the invention are set forth in particular in the appended claims. The invention itself, however, both as to its construction and its method of operation, together with additional objects and advantages thereof, will be best understood from the following description of specific embodiments when read in connection with the accompanying drawing, in which the single figure of the drawing illustrates one embodiment of the invention in semidiagrammatic axial section.

The embodiment illustrated in the drawing comprises a body or machine frame 1 in which there is mounted a rotary spinning chamber 4 journaled in bearings 2 and 3 for free rotation in the body. The spinning chamber has an axially extending hollow cylindrical neck 41 extending outwardly therefrom through which the chamber is rotated by a belt 5 passing around the neck.

The space 42 within the spinning chamber 4 is bounded by the usual plane bottom 43 and annular outer bowed extension 44 in which an annular ring of escape openings 45 are formed for producing a vacuum within the chamber. The spinning chamber is open opposite the plane bottom 43. A collecting surface 46 is provided within the spinning chamber at the extreme radial outer portion of the chamber within the outwardly bowed extension 44; and rotation of the spinning chamber throws fibers therein outwardly to this surface, by centrifugal force, to form a yarn in the spinning chamber.

A guide means is provided for guiding a first yarn 8, which is to become the core of the core yarn 27, through the spinning chamber 4 along the axis of rotation of the latter. This guide means comprises a feeding tube 7 fixed in the body 1 and extending through the neck '41 into the spinning chamber 4. The guide means also comprises a withdrawal tube 10 coaxial with the feeding tube 7 extending oppositely into the spinning chamber.

The pre-spun yarn, which is to form the core of the core yarn to be produced, is drawn by withdrawing rollers 11, acting upon the completed core yarn, from a supply bobbin 21, past a constant pull brake 22 through the feeding tube 7, and through the withdrawal tube 10. Beyond the withdrawing rollers 11 the completed core yarn is wound upon a bobbin 13 by means of a roller 12.

In the rotating spinning chamber 4, and between the exit of the feeding tube 7 and the entrance of the withdrawal tube 10, a winding 24 is applied to the core 8 in a manner which will now be described. A tube 17 passes through an opening 16 in the lower part of the body 1 and enters the spinning chamber 4, being bent toward the collecting surface 46 within the chamber. Previously separated fibers 18 pass through the tube 17, by which they are projected against the collecting surface 46 of the rotating spinning chamber 4. Upon this collecting surface 46 the separated fibers 18 are spun into yarn 25 under influence of the rotation of the spinning chamber and the vacuum produced by the escape openings 45 therein. The spun yarn 25 is the winding 24 with which the core 8 is wound.

In the preferred relationship of the spinning chamber, the yarn-feeding tube and the yarn-withdrawal tube which is shown in the drawings, the yarn-withdrawal tube 10 projects a slight distance into the spinning chamber 4 at the open side thereof opposite to its plane bottom 43. The yarn-feeding tube 7 projects a greater distance into the chamber with its exit end in a position closely adjacent the entrance end 26 of the yarn withdrawal tube. The two tubes are thus separated by a narrow gap which is only a slight axial distance within the spinning cham her and which is materially displaced radial from the collecting surface 46 of the spinning chamber.

Operation of the apparatus is started as follows:

Rotary motion is given the spinning chamber 4. The separated fibers 18 are then conveyed into the chamber through the tube 17 and are further conveyed, by the vacuum Within the chamber and the centrifugal force set up therein, to the collecting surface 46, on which they are deposited in the form of a ribbon 23. Next, a yarn end is threaded into the spinning chamber 4 through the widthdrawal tube 10. Thereupon, the yarn end is brought into contact with the ribbon 23. The yarn end, with the winding yarn of the ribbon 23 spun in, is now progressively withdrawn from the spinning chamber 4 through the withdrawal tube 10. During such withdrawal, turning of the winding yarn 24 takes place, and the end section 25 of such yarn rotates with the collecting surface 26, thus winding the outer yarn 24 about the core 8, between the entrance end 26 of the withdrawing tube 10 and the withdrawing rollers 11. The looped finished core yarn 27 is continuously wound upon the bobbin 13, The operation therefore comprises passing a first yarn 8, which is the core of the core yarn 27, through the continuously rotating spinning chamber 4 along its axis of rotation, feeding previously separated fibers 18 to the spinning chamber to form a second yarn 24 of such fibers, winding this second yarn about the first yarn during rotation of the spinning chamber and withdrawing the two yarns from the chamber in the form of a core yarn.

It will be understood that each of the elements described above, or two or more together, may also find a useful application in other types of spinning machine differing from the types described above.

While the invention has been illustrated and described as embodied in spinning machine for making a core yarn, it is not intended to be limited to the details shown, since various modifications and structural changes may be made without departing in any way from the spirit of the present invention.

Without further analysis, the foregoing will so fully reveal the gist of the present invention that others can by applying current knowledge readily adapt it for various applications without omitting features that, from the standpoint of prior art, fairly constitute essential characteristics of the generic or specific aspects of this invention and, therefore, such adaptations should and are intended to be comprehended within the meaning and range of equivalence of the following claims.

What is claimed as new and desired to be secured by Letters Patent is:

1. A method of producing a core yarn comprising the steps of passing a first yarn through a continuously rotating spinning chamber along the axis of rotation of the latter; feeding fibers to the rotating spinning chamber, twisting said fed fibers in said rotating spinning chamber into a second yarn before contacting said first yarn passing through said spinning chamber and winding the leading portion of the thus formed second yarn about the first yarn by rotation of the spinning chamber; and withdrawing the thus formed core yarn from the spinning chamber.

2. A method as defined in claim 1, wherein the first yarn is withdrawn through a passageway, and wherein the step of winding includes winding the second yarn about the first yarn at the entrance to the passageway.

3. Apparatus for producing a core yarn comprising a rotary spinning chamber having a collecting surface; guide means for guiding a first yarn through said spinning chamber along its axis of rotation and spaced from said collecting surface thereof; means for introducing loose fibers into the rotating spinning chamber spaced from said first yarn and onto the collecting surface of said spinning chamber; means for rotating said spinning chamber to thereby form said fibers on said collecting surface into a second yarn independently of and prior to contacting said first yarn and to wind the thus independently formed second yarn about the first yarn; and means for withdrawing the thus formed core yarn axially from said guide means.

4. Apparatus as defined in claim 3, said guide means including a withdrawing tube, and wherein the means for withdrawing the first and second yarns from said guide means includes a pair of yarn-withdrawing rollers positioned outside of said chamber beyond said withdrawing tube.

5. Apparatus as defined in claim 3, wherein said withdrawing means includes a yarn withdrawal tube extending along the axis of rotation of said spinning chamber and out of said chamber.

6. Apparatus as defined in claim 3, wherein the means for rotating said spinning chamber is a hollow cylindrical shaft on said chamber extending axially therefrom and a belt for rotating said shaft as a pulley.

7. Apparatus as defined in claim 3, wherein said means for injecting fibers into the rotating spinning chamber is a tube extending into the spinning chamber and bent toward its collecting surface.

8. Apparatus as defined in claim 3, wherein the guide means comprises a non-rotary axially positioned yarn feeding tube projecting into the spinning chamber, and a non-rotary axially positioned yarn-withdrawing tube projecting into the spinning chamber opposite said feeding tube.

9. Apparatus as defined in claim 8, wherein said yarnfeeding tube and said yarn withdrawing tube each have a cylindrical passageway for yarn therethrough, and the passageway through said yarn feeding tube has a diameter approximately equal to the diameter of the first yarn.

10. Apparatus as defined in claim 9, wherein the yarnwithdrawing tube projects a slight distance into the spinning chamber at the open side thereof opposite to the plane bottom thereof and the yarn-feeding tube projects a greater distance into a position closely adjacent the yarn-withdrawing tube, said tubes being separated by a narrow gap in which said second yarn is wound about said first yarn.

References Cited UNITED STATES PATENTS 2,202,118 5/1940 Newman et al. 57-5 2,451,881 10/1948 Siegel et al. 575 XR 3,091,909 6/1963 Taylor et al. 5734 3,126,697 3/1964 Cizek et al. 57-5895 XR 3,217,482 11/1965 Baer 57-43 FOREIGN PATENTS 747,345 9/ 1944 Germany.

BILLY S. TAYLOR, Primary Examiner.

US. Cl. X.R. 57-5 8.95 

